Reading about @dimillian's issues with SwiftUI and scroll performance in his Ice Cubes app compared to UIKit, and if I were Apple I'd be flying him down to profile his app and see where SwiftUI could be optimized more/what's going on.

Such a great app and showcase of SwiftUI, and even though complex, media-rich timelines with lots of elements can be complex to get right in UIKit, I think instilling community/developer confidence that "Yeah, SwiftUI can do this too" is really important.